Giant anisotropy of magnetic properties of hydrated iron fluoridotitanate single crystal

A.A.Dubrovskiy Yu.V.Knyazev D.A.Velikanov A.M.Vorotynov N.M.Laptash Yu.V.Gerasimova// JOURNAL OF PHYSICS D-APPLIED PHYSICS //

Study of the magnetic properties of the FeTiF6 ‧ 6 H2O single crystal has shown that this compound is a two-dimensional antiferromagnet with a N é еl temperature of TN = 8 K and its magnetic moment anisotropy attains 7000% at a temperature of T = 4.2 K. The Mössbauer spectroscopy data unambiguously indicate the paramagnetic state of iron cations in the temperature range of 4.2–300 K. However, a sharp change in the difference between the quadrupole doublet linewidths at 10 K has been observed, which is consistent with the temperature of magnetic ordering. It has been suggested that the long-range magnetic order is established in the crystal through the formation of the exchange coupling revealed by the electron spin resonance measurements on the oriented single crystals.